将一个表行与mysql中的另一个表列连接起来

Question

I am new to mysql, Need to join two tables as below scenario

Table One : questions{question_id,question}
Example: question_id  question
         q01          communication skills
         q02          reasoning skills
         q03          technical skills

Table Two : grades{grade_id,grade}
Example : grade_id  grade
          gr01      below avg
          gr02      avg
          gr03      good
          gr04      best

Want to join above two tables for below result
         question_id  question               gr01        gr02  gr03    gr04            
         q01          communication skills   below avg   avg   good    best 
         q02          reasoning skills       below avg   avg   good    best 
         q03          technical skills       below avg   avg   good    best 

Please help if it is possible.

Answer 1

You may want to have a look to same tutorial on database design. There are many good ones on the web. In the mean time, this may help you a little bit: It seems you may need a table for 'persons' or similar such as:

TABLE persons
person_id int autoincrement primary key
person_name varchar(45)
--------
persons_attributes

Then you will have a questions table recording when the attributes of a person were taken

Table questions
question_id int autoincrement primary key
personid int
date_input date
communication_skills_id int
reasoning_skills_id int
technical_skills_id int

and you may need extra tables for: communication_skills; reasoning_skills; and technical_skill with a format as:

TABLE xxx_skills
xxx_skill_id int 
grade varchar(30) #"below average", "average", "good","best"

Then you may join your tables as:

SELECT p.person_name, q.date_input, c.grade communication_skill, r.grade reasoning_skill, t.grade technical_skill
  FROM questions q
    INNER JOIN persons p
    on q.person_id = p.person_id
    INNER JOIN communication_skills c
    ON q.communication_id = c.communication_id
    INNER JOIN reasoning_skills r
    ON q.reasoning_skills_id = reasoning_skills_id
    INNER JOIN technical_skill t
    ON q.technical_skills_id = t.technical_skills_id;